Loose-leaf binder



Nov. 25, 1930. J. c. DAWSON 1,732,647

LOOSE LEAF BINDER" Filed May 7. 1929 E1) 2W1" Jan/71 25 amuson/ Patented Nov. 25, '1 930 UNITED STATES,

JAMES C. DAWSON, OF WEBSTER GROVES, MISSOURI, ASSIGNOR 'ro ELMA n. DAWSON,

PATENT OFFICE Y OF WEBSTER GROVES, MISSOURI LOOSE-LEAF BINDER Application filed May. 7, 1929. Serial No. 861,132.

This invention relates to loose leafbinders and has for its principal object to reduce the cost of production by simplifying the construction and thereby eliminating operations heretofore necessary in the process of manu facture. i I The preferred embodiment of the invention is illustrated in the accompanying drawings, in which I Fig. 1 is a perspective view of a loose leaf binder with portions of the cover broken away; I q i .7

Fig. 2 is an inverted plan View of. the metal parts by which the actual binding of the 15 sheets is elfected; i i a Fig. 3 is a similar plan view of an enlarged fragment; and

Fig. 4 is an enlarged transverse section taken on the line 4-4 of Fig. 3.

In Fig. 1,10 indicate the leaves of a a cover flexibly connected at 11 with a back piece 12. The metal binding parts include a housing 13 and two prong-carrying rods 14. The housing 13 is formed from sheet-metal and includes a body portion 15 having side flanges 16 and endfianges 17 which latter carry tabs 18 to receive rivets 19 for securin the metal parts to the back piece 12.

The rods 14 .are made of cylindrical stock and each is provided with curved prong members 19 and 20, the former having notches 21 for receiving beveled points 22 on the latter ghen the partsare in the position shown in 1g. 1. j l i Adjacent to the prongs the rods are bent. inwardly in Fig. 2 to formarches, the springs of which are indicated at 23 and the crowns at 24. r Heretofore such rods have been made rights and lefts andthe crowns of the arches on one rod have been swaged to produce ribs cooperating with grooves in the crowns of the otherrod, as may be illustrated for example by the patent to Dawson, No. 1,053,579 of February 18, 1913. According to this invention the rods are made duplicates, the crownof one arch of each rod being swaged to provide a recess 25 curved in vertical transverse section and also l in horizontal longitudinal section to correspond with the crown of the arch with which it is to cooperate. As a result, when the parts are assembled as shown in Figs. 2 and 3, the crown of one arch cooperating Withthe walls of the recess in the opposed arch forms a toggle joint which not only permits the desired movement in opening and closing the prongs;

but holds them in proper alignment.

This change in structure makes it possible to useone set of dies only and eliminate one or more operations in forming up the rods, and this results in avery largesaving in the cost of producing the metal parts.

I claim as my invention:

In a loose leaf binder, duplicate prong-carrying rods of circular cross-section, each; rod having two similar arch bends curved longi tudinally, each pair of corresponding arches being in mutual cooperative toggle-joint rela tion, the crown of one arch of each rodhaving a recess therein, said recess conforming to the original curvesofthe crownof the cooperating arch of the other rod and receiving the same in said recess to form thetoggle-joint between said arches.

In testimony whereof I aifix my signature.

JAMES C. DAWSON.v 

